From: Stuart Abramson (stuarta46@yahoo.com)
Date: Sat May 28 2005 - 17:05:21 EDT
All:
Thanks to:
Leon Kazakin
Jee
Bill Hassell
James Perry
Todd Willeat
Vince Taylor
Several people told me that my blocksize for my reads was to small and that fixed me up.
I tried various blocksizes from 512 to 32768 and I/O rate increases from 2 MB/s to 45 MB/s (depending on server, disk, etc.). Block Size of 8192 gives me about 20-30 MB/s on hpux L3000s connected to EMC Symmetrix DMX 2000 with 2 Gb/s FAs:
((BS=8192))
((Count=5120000/BS))
TIME=$(timex dd if=$Disk of=/dev/null count=$Count bs=$BS 2>&1 \
| grep real | awk '{print $2}' )
MBpS=$( FDIV 5.12 $TIME )
printf "%5s %6s %8s %6s %6s %6s %6s \n" \
$LUN $ARRAY $DISK $SP $BS $TIME $MBpS
Thanks.
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